/* Lesson pages, quizzes and the certificate. Builds on site.css tokens. */
:root { --ok: #1f7a3a; --no: #b3261e; --code-bg: #f5f5f7; --tint: rgba(196,116,31,0.10); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --ok: #63e6a0; --no: #ff8a80; --code-bg: #161617; --tint: rgba(232,160,74,0.14);  color-scheme: dark; } }
:root[data-theme="dark"] { --ok: #63e6a0; --no: #ff8a80; --code-bg: #161617; --tint: rgba(232,160,74,0.14);  color-scheme: dark; }

/* Course page title: a full sentence, sized to stay on one line on laptop and desktop screens */
.hero h1.course-title { font-size: clamp(28px, 3.6vw, 52px); }

.lesson-hero { max-width: 1100px; margin: 0 auto; padding: 36px 22px 8px; }
.lesson-hero .eyebrow { margin: 0; font-size: 14px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--lamp); }
.lesson-hero h1 { font-size: clamp(36px, 6vw, 60px); line-height: 1.05; margin: 6px 0 10px; letter-spacing: -0.015em; text-wrap: balance; }
.lesson-hero .status { margin: 0; font-size: 14px; color: var(--muted); min-height: 1em; }
.lesson-hero .status.ok { color: var(--ok); font-weight: 600; }
.lesson-hero .status.ok::before { content: "✓ "; }
.cert-page .lesson-hero { max-width: 760px; }
.lede-sm { color: var(--muted); font-size: 19px; margin: 0; }

.lesson-grid { max-width: 1100px; margin: 0 auto; padding: 8px 22px 64px; display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 48px; }
.lesson-grid aside { position: relative; }
.toc { position: sticky; top: 72px; font-size: 14px; }
.toc p { margin: 18px 0 8px; font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule); }
.toc li a { display: block; padding: 5px 0 5px 14px; color: var(--muted); line-height: 1.3; }
.toc li a:hover { color: var(--text); text-decoration: none; }
@media (max-width: 900px) {
  .lesson-grid { grid-template-columns: 1fr; gap: 0; }
  .toc { position: static; background: var(--band); border-radius: 16px; padding: 4px 18px 14px; margin-bottom: 8px; }
  .toc ol { border: 0; }
  .toc li a { padding-left: 0; }
}

.prose { max-width: 760px; min-width: 0; }
.prose h2 { font-size: clamp(26px, 3.2vw, 34px); line-height: 1.12; margin: 56px 0 14px; scroll-margin-top: 72px; text-wrap: balance; }
.prose h3 { font-size: 21px; margin: 32px 0 8px; }
.prose p, .prose ul, .prose ol { margin: 0 0 14px; }
.prose li { margin: 4px 0; }
.prose > :first-child { margin-top: 24px; }
.prose blockquote { margin: 18px 0; padding: 12px 18px; background: var(--band); border-left: 3px solid var(--lamp); border-radius: 0 12px 12px 0; }
.prose blockquote p:last-child { margin: 0; }
.prose code { background: var(--code-bg); border-radius: 6px; padding: 1px 5px; overflow-wrap: anywhere; }
.prose pre { background: var(--code-bg); border-radius: 14px; padding: 16px 18px; overflow-x: auto; font-size: 14px; line-height: 1.5; margin: 0 0 18px; }
.prose pre code { background: none; padding: 0; font-size: inherit; overflow-wrap: normal; }
.prose .table { overflow-x: auto; margin: 0 0 18px; border: 1px solid var(--rule); border-radius: 14px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; }
.prose th, .prose td { text-align: left; vertical-align: top; padding: 10px 14px; border-bottom: 1px solid var(--rule); }
.prose th { background: var(--band); font-weight: 600; }
.prose tr:last-child td { border-bottom: 0; }
.prose li.todo { list-style: none; position: relative; }
.prose li.todo::before { content: ""; position: absolute; left: -1.5em; top: .3em; width: .9em; height: .9em; border: 1.5px solid var(--muted); border-radius: 4px; }
.prose figure.diagram { margin: 24px 0; background: #fff; border: 1px solid var(--rule); border-radius: 18px; padding: 12px; }
.prose figure.diagram img { width: 100%; height: auto; }

/* Check yourself */
.prose details.check { border: 1px solid var(--rule); border-radius: 14px; padding: 12px 16px; margin: 0 0 18px; background: var(--tint); }
.prose details.check summary { font-size: 17px; font-weight: 400; display: block; }
.prose details.check summary::after { content: none; }
.prose details.check summary span { display: block; font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--lamp); margin-bottom: 2px; }
.prose details.check summary span::after { content: " · tap for the answer"; text-transform: none; letter-spacing: 0; font-weight: 400; color: var(--muted); }
.prose details.check[open] summary span::after { content: ""; }
.prose details.check p { margin: 8px 0 0; color: var(--muted); }
.prose details.check + details.check { border-top: 1px solid var(--rule); }

/* Quiz */
.quiz { margin-top: 64px; background: var(--band); border-radius: 22px; padding: 6px 24px 24px; }
.quiz h2 { margin-top: 24px; }
.quiz-intro { color: var(--muted); }
.quiz fieldset { border: 0; margin: 0 0 18px; padding: 16px; background: var(--bg); border-radius: 16px; border: 1.5px solid transparent; }
.quiz fieldset.right { border-color: var(--ok); }
.quiz fieldset.wrong { border-color: var(--no); }
.quiz legend { font-weight: 600; padding: 0; margin-bottom: 8px; float: left; width: 100%; }
.quiz label { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border-radius: 10px; cursor: pointer; clear: both; }
.quiz label:hover { background: var(--band); }
.quiz input[type=radio] { margin-top: .3em; accent-color: var(--lamp); flex: none; }
.quiz .why { margin: 10px 0 0; font-size: 15px; color: var(--muted); clear: both; }
.quiz .why b { color: var(--text); }
.quiz-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
button { font: inherit; font-size: 15px; font-weight: 600; border: 0; border-radius: 999px; padding: 10px 20px; cursor: pointer;
  background: var(--text); color: var(--bg); min-height: 40px; }
button.secondary { background: transparent; color: var(--text); border: 1px solid var(--rule); }
button:focus-visible { outline: 2px solid var(--link); outline-offset: 3px; }
.result { margin: 0; font-weight: 600; }
.result.ok { color: var(--ok); }
.result.no { color: var(--no); }

/* Prev / next */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 32px; }
.pager a { display: block; background: var(--band); border-radius: 16px; padding: 14px 18px; color: var(--text); font-weight: 600; }
.pager a:hover { text-decoration: none; background: color-mix(in srgb, var(--band) 80%, var(--text) 8%); }
.pager a span { display: block; font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.pager .next { text-align: right; grid-column: 2; }
@media (max-width: 480px) { .pager { grid-template-columns: 1fr; } .pager .next { grid-column: 1; } }

/* Curriculum additions */
.parts .open { margin: 12px 0 0 2.2em; }
.parts .open.soon { color: var(--muted); font-size: 15px; }
.parts summary .tag.ok { color: var(--ok); }

/* Certificate page */
.cert-page > section, .cert-page > .note { max-width: 760px; margin: 0 auto; padding: 0 22px; }
.cert-progress { margin-top: 24px !important; }
.bar { height: 8px; background: var(--band); border-radius: 999px; overflow: hidden; margin: 8px 0 12px; }
.bar span { display: block; height: 100%; width: 0; background: var(--lamp); border-radius: 999px; transition: width .4s; }
.cert-list { list-style: none; margin: 16px 0 0; padding: 0; border-top: 1px solid var(--rule); }
.cert-list li { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.cert-list li span { color: var(--muted); font-size: 15px; white-space: nowrap; }
.cert-list li.ok span { color: var(--ok); font-weight: 600; }
.cert-list li.ok span::before { content: "✓ "; }
.cert-claim { margin-top: 32px !important; }
.cert-claim label { display: block; font-weight: 600; margin-bottom: 8px; }
.cert-claim .row { display: flex; gap: 10px; flex-wrap: wrap; }
.cert-claim input { flex: 1 1 240px; font: inherit; padding: 10px 14px; border-radius: 12px; border: 1px solid var(--rule); background: var(--bg); color: var(--text); min-height: 44px; }
.certificate { margin-top: 32px !important; }
.certificate .frame { background: #fffdf8; color: #1d1d1f; border: 1px solid #e3d9c6; outline: 6px double #e8dcc4; outline-offset: -18px;
  border-radius: 6px; padding: 56px 40px 40px; text-align: center; }
.certificate .frame img { margin: 0 auto 12px; }
.certificate .kicker { font-size: 12px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: #8a5a1c; margin: 0 0 24px; }
.certificate .awarded { margin: 0; color: #6e6e73; }
.certificate .who { font-size: clamp(30px, 5vw, 44px); font-weight: 700; margin: 6px 0 12px; letter-spacing: -0.01em; overflow-wrap: anywhere; }
.certificate .course { font-size: clamp(22px, 3vw, 28px); font-weight: 600; margin: 6px 0 12px; }
.certificate .detail { max-width: 480px; margin: 0 auto 28px; color: #6e6e73; font-size: 15px; }
.certificate .sig { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; color: #6e6e73; border-top: 1px solid #e3d9c6; padding-top: 12px; }
.cert-actions { text-align: center; margin-top: 16px; }
.cert-page .note { color: var(--muted); font-size: 14px; margin: 24px auto 64px !important; }
@media print {
  .nav, .footer, .lesson-hero, .cert-progress, .cert-claim, .cert-actions, .note { display: none !important; }
  .certificate { margin: 0 !important; padding: 0 !important; }
  body { background: #fff; }
}

/* Copy buttons */
.prose .code { position: relative; }
.prose .code pre { padding-right: 76px; }
.prose button.copy { position: absolute; top: 8px; right: 8px; min-height: 30px; padding: 4px 12px; font-size: 13px;
  background: var(--bg); color: var(--text); border: 1px solid var(--rule); }
.prose button.copy:hover { border-color: var(--muted); }

/* Downloads */
.downloads { margin-top: 56px; border: 1px solid var(--rule); border-radius: 22px; padding: 4px 24px 18px; }
.downloads h2 { margin-top: 20px; }
.downloads > p { color: var(--muted); }
.downloads ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.downloads li { display: grid; grid-template-columns: minmax(0, 260px) minmax(0, 1fr); gap: 4px 16px; align-items: center;
  padding: 10px 0; border-top: 1px solid var(--rule); }
.downloads li:first-child { border-top: 0; }
.downloads a.dl { display: flex; flex-direction: column; gap: 2px; padding: 10px 14px; border-radius: 12px; background: var(--band); color: var(--text); }
.downloads a.dl:hover { text-decoration: none; background: color-mix(in srgb, var(--band) 80%, var(--text) 8%); }
.downloads .dl-label { font-weight: 600; }
.downloads .dl-label::before { content: "↓ "; color: var(--lamp); }
.downloads .dl-file { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.downloads .dl-what { color: var(--muted); font-size: 15px; }
@media (max-width: 600px) { .downloads li { grid-template-columns: 1fr; } }
.prose td code { white-space: nowrap; overflow-wrap: normal; }